Fish Identifier vs Quantum Mechanics Notes

PREMIUM — PURCHASE REQUIRED: All features described below are part of Pro and require a purchase: a weekly or yearly auto-renewing subscription, or a one-time lifetime purchase. Identify a fish from a photo, learn the traits that distinguish it, and keep a useful record of what you caught. PHOTO IDENTIFICATION Take a clear photo or choose one from your library. Fish Identifier returns a species suggestion, scientific name and confidence score when the identification service can make a result. The app never substitutes a random species when a request fails. Results are educational suggestions, not safety or regulatory advice. Always confirm local fishing limits, invasive-species rules, edibility and safe handling with an official source. PRIVATE CATCH LOG Record the details you actually know: • Species and date • Length and weight • Fishing spot and notes • Kept or released status Your catch log and saved identification history stay on your device. You can edit or delete records at any time. CURATED SPECIES GUIDE Browse 36 freshwater, saltwater, river, lake, reef and ocean species. Search by common or scientific name and filter by habitat. Profiles include physical traits, habitat and range, with additional detail available in Premium. FISH IDENTIFIER PREMIUM Premium unlocks unlimited photo identifications, complete species details and full identification history. Available plans and localized prices are shown by the App Store before purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. A lifetime option may also be available. Restore Purchases is included. PRIVACY The app does not include advertising or analytics SDKs and does not track you across apps or websites. A selected photo is sent over HTTPS only when you request identification. Catch-log data is not included in that request. Purchases are processed by Apple. Terms of Use: https://leanstudio.asia/terms-of-use Privacy Policy: https://leanstudio.asia/privacy-policy Support: support@leanstudio.asia

Quantum Mechanics Notes — a complete quantum mechanics study system in your pocket. WHAT THIS IS An original, systematic library of quantum mechanics study notes — 47 articles organized into six parts along a natural learning path: 1. Quantum Behavior & Foundations — double-slit interference, wave-particle duality, uncertainty relations 2. Formalism & Mathematical Structure — Hilbert space, operators, the Schrödinger equation, path integrals 3. Many Bodies, Symmetry & Condensed Matter — identical particles, atoms and molecules, band theory, superconductivity, the quantum Hall effect 4. Quantum Information & Quantum Optics — entanglement, teleportation, quantum computing, field quantization 5. Relativistic Theory & Frontiers — the Klein-Gordon equation, the Dirac equation, quantum field theory, quantum gravity 6. Gems & Minerals Special Topics — crystal field theory, color centers, spectroscopy, first-principles methods HIGHLIGHTS · 6,200+ LaTeX formulas individually typeset — a reading experience close to a printed textbook · 92 numerical simulation figures (interference buildup, band structure, decoherence dynamics, and more), each backed by a viewable Python script · Everything works fully offline — no network needed, perfect for commutes, labs, and exam week · Built-in LaTeX renderer: type or paste any formula and see it rendered instantly, with full-screen display · Import your own Markdown notes and photo albums, and bind them to the articles you are reading · Reading progress, table-of-contents navigation, dark and light themes PLEASE NOTE The notes are written in Simplified Chinese, and the app interface is in Chinese as well. Formulas, figures, and structure can be followed without Chinese, but the prose is not translated. COMPLETELY FREE The app is free with no ads, no paywalls, and no account required. "Support the Author" in Settings is an optional tip that unlocks nothing — all 47 articles are free for everyone, forever. WHO IT'S FOR Physics students preparing for exams or graduate-school entrance tests, researchers who need a quick formula reference, and self-learners who want a systematic understanding of quantum mechanics. Each article's mathematical level is labeled (L1 conceptual to L4 frontier), so you can choose your own starting point.